Restructure application to use /home for authenticated pages

- Move authenticated home page from /[locale] to /[locale]/home
- Move login page from /[locale]/login to /[locale] (new landing page)
- Move all restricted pages (bill, location, year-month, print, account) under /[locale]/home
- Simplify middleware to protect all routes under /home instead of using publicPages array
- Update auth config: change signIn page from /login to /
- Update SignInButton callback URL to redirect to /home after login
- Update all internal links throughout the application to reflect new structure
- Update server action redirects in navigationActions.ts
- Public share routes (/share/*) remain unchanged

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/[locale]/home/year-month/[id]/add/page.tsx

@@ -0,0 +1,13 @@
+import { addMonth } from '@/app/lib/actions/monthActions';
+import { gotoHome } from '@/app/lib/actions/navigationActions';
+import { parseYearMonth } from '@/app/lib/format';
+
+export default async function Page({ params:{ id } }: { params: { id:string } }) {
+
+    const { year, month } = parseYearMonth(id);
+    await addMonth({ year, month });
+
+    await gotoHome({ year, month });
+
+    return null; // if we don't return anything, the client-side will not re-validate cache
+}